Authorized SKF Distributor Ball, roller, needle, thrust and mounted bearings for industrial buyers worldwide
Buying for several machines? Add this model to one inquiry with the other SKF bearings, housings and accessories on your list. Each line keeps its own designation, quantity and specification.
Send Your Full List| Parameter | Details |
|---|---|
| Bearing Type | Double Row Cylindrical Roller Bearing |
| Outer Dimension Range | Medium and Large (120-190mm) |
| Material | Bearing Steel |
| Alignment Type | Non-Aligning Bearings |
| Load Direction | Axial Bearing |
| Separable Design | Separated |
| Internal Clearance | C0, C2, C3, C4, C5 |
| Cage Material | Brass, Steel |
| Vibration Class | Z1V1, Z2V2, Z3V3 |
| Surface Hardness | 60-64 HRC |
| Transport Package | Carton Pallet |
| Origin | Jiangsu, China |
| HS Code | 8482800000 |
| Industry | Typical Applications |
|---|---|
| Heavy Machinery | Industrial gearboxes, rolling mill rolls, large-scale conveyors |
| Steel & Metallurgy | Continuous casting machines, extrusion equipment |
| Mining | Crusher main shafts, conveyor drive systems |
| Power Generation | Generator rotor supports, turbine auxiliary components |
Finding a bearing that can handle the extreme loads and continuous operation of heavy machinery is a constant challenge for maintenance engineers and procurement managers. Premature failures due to misalignment, inadequate load capacity, or poor material quality lead to costly downtime, production losses, and safety risks. Sourcing the right replacement often means navigating complex part numbers across multiple suppliers, delaying critical repairs.
The NNU4938 B/Sp W33 Double Row Cylindrical Roller Bearing addresses these challenges with its robust design and precision engineering. As a double row cylindrical roller bearing with a brass cage, it provides exceptional radial load capacity and rigidity—essential for equipment like rolling mills, crushers, and industrial gearboxes. Our extensive inventory and multi-brand procurement capabilities ensure you can source this exact specification or its equivalents without unnecessary delays, supported by ISO 9001 certified quality control processes.
This bearing excels in applications where high radial loads and moderate axial loads are present, operating within temperature ranges typical of heavy industrial environments. Its separable design allows for easy installation and maintenance, while the non-aligning configuration suits machinery with minimal shaft deflection. The NNU4938 B/Sp W33 is particularly well-suited for heavy-duty machinery requiring reliable performance under continuous operation, such as steel mill rolling stands and mining equipment drive systems.
The bearing's 60-64 HRC surface hardness—achieved through precision heat treatment—provides excellent wear resistance and fatigue strength, critical for extending service life in high-stress applications. The brass cage offers superior thermal conductivity and dimensional stability compared to polymer alternatives, reducing friction and heat buildup during high-speed operation. Available internal clearances (C0 to C5) allow customization for specific operating conditions, from tight fits in precision machinery to expanded clearances for thermal expansion in high-temperature environments. The Z1V1 to Z3V3 vibration classes ensure smooth operation, minimizing noise and reducing stress on adjacent components.
Selecting a properly specified bearing like the NNU4938 B/Sp W33 directly impacts your bottom line. While initial costs may be higher than inferior alternatives, the extended service life and reduced maintenance requirements significantly lower total cost of ownership. Poorly matched bearings often fail prematurely, leading to unplanned downtime, replacement part expenses, and potential damage to expensive equipment. By following industry standards for load rating and application suitability, this heavy-duty machinery bearing ensures predictable performance and reduces the risk of catastrophic failures, ultimately protecting your production schedule and equipment investment.
Our manufacturing and procurement processes adhere to ISO 9001 standards, with rigorous inspection of raw materials and finished products to ensure dimensional accuracy and material integrity. Each bearing undergoes hardness testing, dimensional verification, and surface finish inspection before shipment. We provide a warranty against manufacturing defects, with clear procedures for returns and replacements. Our global network of suppliers allows us to source both standard and hard-to-find bearing models, ensuring you get the exact specifications you need. With substantial inventory, we support quick turnaround for urgent maintenance requirements, helping you minimize equipment downtime.
Whether you need the NNU4938 B/Sp W33 Double Row Cylindrical Roller Bearing or another specific model, we can provide pricing and availability quickly. Simply share the bearing model number, dimensions (d x D x B), and required quantity, and our team will confirm stock and delivery options. With our multi-brand sourcing capability, we can also assist with cross-referencing part numbers from major manufacturers to find the right fit for your equipment.
Q: Can you supply bearings from other brands or with different specifications?
A: Yes, we support procurement of bearings across all major international and domestic brands. We can source to your exact specifications, including custom dimensions and materials where available.
Q: How do I确认 if this bearing is compatible with my equipment?
A: Provide your equipment model number or the bearing's critical dimensions (bore diameter, outer diameter, width), and our technical team will verify compatibility with the NNU4938 B/Sp W33 or recommend alternatives.
Q: What is your warranty policy for this bearing?
A: We offer a warranty against manufacturing defects. Specific terms depend on application and operating conditions, with details outlined in our sales agreement.
Q: What is the minimum order quantity for this bearing?
A: We accept small orders for maintenance needs, with no strict minimum quantity. Larger volume discounts are available for production orders.
Q: How quickly can you ship the NNU4938 B/Sp W33 bearing?
A: If in stock, we ship within 1-2 business days. For non-stock items, lead times depend on manufacturer availability, typically 2-4 weeks.
Q: Do you offer custom bearing solutions (OEM/ODM)?
A: Yes, we support custom bearing manufacturing based on your drawings or specifications, including specialized materials, coatings, and cage designs.
Ready to order or need a quote?
Send the bearing model, dimensions (d x D x B), and quantity — we'll get back to you with pricing and lead time.
Electrical Equipment is an Authorized SKF Distributor that turns mixed equipment lists into itemised, comparable quotes and consolidated supply for industrial plants, maintenance contractors and distributors worldwide.
Ball, roller, needle, thrust, mounted and precision bearings handled in a single industrial order.
One inquiry covers parts for different machines, with designations and internal stock codes matched line by line.
Routine replacement bearings and special-specification models are labelled separately on your quote.
Identification gaps are closed before quoting; any alternative is listed separately for your approval.
These SKF models share the category of Double Row Cylindrical Roller Bearing NNU4938 B/Sp W33 with Brass Cage for Heavy-Duty Machinery and can be quoted on the same inquiry.
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04 Double Row Cylindrical Roller Bearing NNU4938 B/Sp W33 with Brass Cage for Heavy-Duty Machinery is specified in the applications below. Open an application to see the matching SKF bearing categories.
Industrial buyers in the USA, Mexico, Oman, France, New Zealand and Brazil source genuine SKF bearings and mixed lists through Electrical Equipment.
"When a critical piece of rotating equipment failed, we needed a mixed SKF list urgently. The supplier consolidated the order, shipped same-day, and the parts were on our plant floor in two days. The equipment was back online before the end of the shift."
Ahmed Al-FarsiFarsi Industrial Services · Oman "We had a bad experience with counterfeit SKF bearings from another supplier. The bearings from skfus.com are genuine, traceable, and the packaging matches SKF's current format. Our reliability team verified the first batch and we now use them as our primary source."
Luis HernandezHernandez Manufacturing · Mexico "The SKF mounted units and insert bearings we ordered for a conveyor upgrade were supplied with the correct housing and locking arrangement. Our maintenance team installed them without modification. No noise, no leaks, no call-backs."
Graham McLeodMcLeod Fabrication · New Zealand These guides cover selection, identification and replacement points relevant to Double Row Cylindrical Roller Bearing NNU4938 B/Sp W33 with Brass Cage for Heavy-Duty Machinery.
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Read the guideShort answers on identification, mixed orders, quote terms and substitutions at Electrical Equipment.
Send a clear photo of the bearing markings and note which details still need confirming. We close identification gaps, including the exact specification and complete assembly, before you accept a quote. Nothing is substituted to fill a gap.
Yes. Standard, precision and mounted units can sit in one itemised inquiry, with each line keeping its own designation, quantity and specification. Housings and mounting accessories are added when they are part of your supply scope.
Each quote lists the designation, quantity, price and currency, stock availability, estimated lead time and quote validity. Applicable freight or tax terms are stated, and the product documents available for your order are confirmed.
Only with your approval. Any alternative is marked separately on the quote, and every technical change needs sign-off from the buyer before an order is placed.
Send this model alone or with your full SKF list. We verify the identification details on every line first, then issue an itemised written quote with lead time and validity.
